Description

Mercury 18545A1 is a genuine OEM power trim pump overhaul repair kit for selected Mercury MerCruiser applications using an Oildyne power trim pump. Dealer listings identify it as 18545A1 Repair Kit, and older part number 18545 is shown as superseded to 18545A1.

Key Features

• Genuine Mercury Marine / Quicksilver OEM repair kit
• Part number 18545A1
• Identified as a power trim pump overhaul repair kit
• Specifically tied to Oildyne power trim pump service applications
• Legacy part 18545 supersedes to this updated kit number

Engine Compatibility
This kit is associated with selected Mercury MerCruiser trim pump and motor component applications that use the Oildyne-style power trim pump. Parts-diagram listings show it in sterndrive trim pump assemblies, including later MerCruiser sterndrive applications, but exact fitment should always be confirmed by model and serial number before ordering.

Serial Number Fitment Notice
Please confirm compatibility in the Mercury Parts Catalog using your exact engine or drive serial number before purchase. Mercury’s catalog is organized by model and serial number for accurate parts lookup.

When This Part Needs Replacement
This kit is typically used when the trim pump is leaking, losing pressure, cycling poorly, or being rebuilt during trim system service. Because it is sold as an overhaul repair kit for the pump itself, it is most commonly used during internal trim pump reseal and repair work. That service context is an inference based on the kit’s documented purpose.

Installation Notes
Install this kit only on the exact Oildyne trim pump application that calls for 18545A1. Trim pump components can vary by pump design and serial range, so matching by the correct Mercury diagram is the safest approach before disassembly.

Alternate / Superseded Part Numbers

• 18545A1
• Supersedes 18545

Parts Desk Insight
Trim pump rebuild kits are the kind of parts you usually buy to fix a known issue, not just to keep on the shelf. Matching the exact pump style matters here, because a repair kit that is close is still no good if the internal O-rings and seals do not match the original Oildyne pump setup.

Shipping: Ships same or next day for fast Canada wide shipping.